package com.ld.businesscard_manage.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.read.listener.ReadListener;
import com.alibaba.excel.util.ListUtils;
import com.ld.businesscard_manage.bean.*;
import com.ld.businesscard_manage.service.BusinessCardService;
import com.ld.businesscard_manage.service.UserService;
import com.ld.businesscard_manage.service.impl.BusinessCardServiceImpl;
import com.ld.businesscard_manage.service.impl.UserServiceImpl;
import org.apache.commons.codec.digest.DigestUtils;

import java.util.List;

import static java.lang.System.out;

public class MyUploadDataListener implements ReadListener<MyCardsImportExcel> {
	/**
	 * 每隔5条存储数据库，实际使用中可以100条，然后清理list ，方便内存回收
	 */
	private static final int BATCH_COUNT = 100;
	/**
	 * 缓存的数据
	 */
	private List<MyCardsImportExcel> cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);
	/**
	 * 假设这个是一个DAO，当然有业务逻辑这个也可以是一个service。当然如果不用存储这个对象没用。
	 */
	private BusinessCardService cardService;
	private User user;

	public MyUploadDataListener() {
		// 这里是demo，所以随便new一个。实际使用如果到了spring,请使用下面的有参构造函数
		cardService = new BusinessCardServiceImpl();
	}
	public MyUploadDataListener(User user){
		cardService = new BusinessCardServiceImpl();
		this.user = user;
	}



	/**
	 * 这个每一条数据解析都会来调用
	 *
	 * @param data    one row value. Is is same as {@link AnalysisContext#readRowHolder()}
	 * @param context
	 */
	@Override
	public void invoke(MyCardsImportExcel data, AnalysisContext context) {
		cachedDataList.add(data);
		// 达到BATCH_COUNT了，需要去存储一次数据库，防止数据几万条数据在内存，容易OOM
		if (cachedDataList.size() >= BATCH_COUNT) {
			saveData();
			// 存储完成清理 list
			cachedDataList = ListUtils.newArrayListWithExpectedSize(BATCH_COUNT);
		}
	}



	/**
	 * 所有数据解析完成了 都会来调用
	 *
	 * @param context
	 */
	@Override
	public void doAfterAllAnalysed(AnalysisContext context) {
		// 这里也要保存数据，确保最后遗留的数据也存储到数据库
		saveData();
	}

	/**
	 * 加上存储数据库
	 */
	private Msg saveData() {
		int all = 0;
		int success = 0;
		for (MyCardsImportExcel card : cachedDataList) {
			all ++;
			BusinessCard myCard = new BusinessCard();
			myCard.setName(card.getName());
			myCard.setSex(card.getSex());
			myCard.setAccount(user.getUsername());
			myCard.setPassword(user.getPassword());
			myCard.setEmail(card.getEmail());
			myCard.setValid(card.getValid());
			int i = cardService.addCard(myCard);
			success += i;
			}
		out.println("共插入" + all + "条数据");
		out.println("成功" + success + "条");
		return new Msg(all,success);
	}
}
